Canada



J. D.'BAKER `PLASTFR BOARD.

(No Model.)

Patented Mar. 2:1, 1893.

Qpiflwafeooeo Miren'. Sf'rjArns l.urnas n. BAKER, on MONTREAL, CANADA.

PLAST-seasoned .SPECIFICATION forming part Of Letters Patent No. 493,961, dated March 21, 1893,

` Application tiled March Z8, 1892. Serial'lll'o. 426,783. (No model.)

y .To all whom it may concern:

v ing apart.

Be it knownthat I, JAMES DAY BAKER, ot' the city of Montreal, in the county of Montreal and Province of Quebec, Canada, have invented certain .new and useful Improvements in Plaster-Boards; and I do'herebydeclare that the following is a full, clear, and

exact descriptiongof the same.

My invention has referenceto the sections of plaster sheeting affixed to walls and used as ceilings, and more especially to the means by which the edges of the several sections are secured together so as to'obviate their shrink- Up tothe present time it has been necessary, in order to give a presen-table appearance to a wall or ceiling covered with,or composed of plaster sheeting, to cover the whole surface with a coat of mortar. 4 By this invention this is not needed, the ceiling or wall lining presenting a perfectly even 4and unbroken surface.

The plaster boards to which my invention refers are usually formed of a facing coat of plaster and a backing,'the .meeting edges of which may be of any corresponding sections. In this construction the plaster facing is omitted for any desired Width on two adjacent sides of the board, so as to afford a sunken face, the other two adjacent sides (presuming that, asusual, the board is four-sided) being of the full thickness of the board bot-h hacking and facing. In these last two adjacent sides are set strips of textile fabric projecting'frorn their faces and approximately of the Width of the sunken faces on the other two sides of the board.

When two boards are brought together the edge of one board whichis of the full thickness is brought against and meets the edge of the other board which has the sunken face. As soon as they arein contact the textile strip projecting from the edge of the one board will be laid upon the sunken face of the other and secured in place by plaster size or other means. The space left by the sunken face `on the edge of the one board is then iiled up by plaster as shown and a finishing coat usually put on.

In som'e cases the face of the boards ma'y 5o For full comprehension however of the in- 'vention, reference must be had to the annexed drawings. in Which-- Figure l is a sectional view showing the edges of two boards apart.; Fig. 2 asimilar view showing them joined together and Fig;

v3 a modification ot' same.

' Like symbols denote the same parts.

A is the plaster facing of the' board and ,B the backing. C .being a strip of textile material, such as canvas, orhessians, held between them or in the backing.

A shows the sunken face on'two edges of the board; Aswill be seen in Fig. 2 the space left by the sunken face A is, when the strip C is secured downen the top of the backing, filled in byplaster as at D, so as to give the even surface.

In Fig. 3 both boardshave the sunken face A on their meeting edges, and the strips t) are wide enough to cover both, one being laid on the top of the. other. l

It will be understood that this inventionv is applicable to all plaster boards composed of plaster faci n g and a backing ot anykind, and

that the meeting edges of the boards may be of any outline, or simply butt against each other.

What I claim is as follows:

A plaster board formed of a plaster facing and backing having a sunken face round two of its edges and strips of textile fabric secured in its other two edges between the backing and facing and adapted to liein the sunken faces of adjacent boards by means of which adjacent boards may be secured together by a suitable plastic filling.

Montreal, March 23, 1892.

Y JAMES DBAKER. In presence of*- FRED. J. SEARS, WILL. RlttcFuAT. 

